A more profound research finds the initial presentation of this stamp : "Special stamps for card sent abroad". These bleu and red stamps are sold in booklet of six, with a discount (0,60 CHF for a six-blue-stamp booklet, 0,80 CHF for the red version). The discount is made possible because these two stamps can only be used for postcards, not letters (read the message inside a booklet).

These stamps help greatly the foreign tourists in Swiss, with a discount. We all are not patient or interested enough to take time and discover the philatelic state of a post office during our holidays.